I can’t be arsed to track my calorie intake on MyFitnessPal or a similar app again, though.
Like I said, if you're happy to eat the same thing every day, you only have to do this once. You don't need to get into the whole adding shit as you go madness. Just use it to give you calorie counts on a single meal plan and stick with it. See where the weight goes. Then you can easily adjust it up or down depending on what the scale and mirror are telling you.
It's always worth doing at least once IMO because people for the most part are really, really bad at judging how much they eat.